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net: alteon: Simplify DMA setting 

As stated in [1], dma_set_mask() with a 64-bit mask will never fail if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

If dma_set_mask_and_coherent() succeeds, 'ap->pci_using_dac' is known to be
1. So 'pci_using_dac' can be removed from the 'struct ace_private'.

Simplify code and remove some dead code accordingly.

[1]: https://lkml.org/lkml/2021/6/7/398

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/1a414c05c27b21c661aef61dffe1adcd1578b1f5.1641651917.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Christophe JAILLET 2022-01-08 15:26:06 +01:00 committed by Jakub Kicinski
parent 21ef11eaf3
commit ba8a586349
2 changed files with 2 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/net/ethernet/alteon/acenic.c
View File

@ -589,8 +589,7 @@ static int acenic_probe_one(struct pci_dev *pdev,
}
ap->name = dev->name;
if (ap->pci_using_dac)
dev->features |= NETIF_F_HIGHDMA;
dev->features |= NETIF_F_HIGHDMA;
pci_set_drvdata(pdev, dev);
@ -1130,11 +1129,7 @@ static int ace_init(struct net_device *dev)
/*
* Configure DMA attributes.
*/
if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
ap->pci_using_dac = 1;
} else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
ap->pci_using_dac = 0;
} else {
if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
ecode = -ENODEV;
goto init_error;
}

1
drivers/net/ethernet/alteon/acenic.h
View File

@ -692,7 +692,6 @@ struct ace_private
__attribute__ ((aligned (SMP_CACHE_BYTES)));
u32 last_tx, last_std_rx, last_mini_rx;
#endif
int pci_using_dac;
u8 firmware_major;
u8 firmware_minor;
u8 firmware_fix;